." >> fruits and vegetables are good for you because they make you healthy and they give you more energy. >> they have a lot of nutrients, i guess. >> they have a lot of vitamins that you need... and have good fiber. >> they're healthier than fast food. [ chuckles ] >> vitamins -- check. fiber -- check. fruits and vegetables are good for you, but sometimes they're not as healthy as we think. for example, this apple could carry leftover pesticides. >> these are chemicals that are used to kill living organisms like pests and weeds during the growing phase. >> sara belongs to the environmental working group. its goal is to fight pollution, and that includes identifying foods that have traces of pesticide, or as sara calls it, residue. the worst cases are put on a list they call the dirty dozen. >> every year the federal government tests fruits and vegetables, and what our list is, the dirty dozen list, is a list that we look at the testing results, and then we rank the produce, the fruits and vegetables, based on the total amount of residue that is on those fruits and vegetables. >> when we